Reports suggest much of the jihadis' communication is done via the Telegram app, the social media network of choice for jihadis ever since Twitter and Facebook cracked down on the group's presence on their networks.

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The New York Times reported ISIS has changed its strategy in the past year, switching from encouraging supporters to join its self-proclaimed Caliphate and instead asking them to launch attacks within their home countries.

This was noticeable in an ISIS audio statement released in May, 2016, calling on supporters to make Ramadan "a month of calamity everywhere for the non-believers".

Seamus Hughes, from George Washington University, described the handlers as "quarterbacking" the attacks.